• Journal of KIISE:Computer Systems and Theory
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• v.36 no.5
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• pp.360-370
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• 2009

Using solar power in wireless sensor networks requires a different approach to energy optimization from networks with battery-based nodes. Solar energy is an inexhaustible supply which can potentially allow a system to run forever, but there are several issues to be considered such as the uncertainty of energy supply and the constraint of rechargeable battery capacity. In this paper, we present SolarSS: a reliable storage system for solar-powered sensor networks, which provides a set of functions, in separate layers, such as sensory data collection, replication to prevent failure-induced data loss, and storage balancing to prevent depletion-induced data loss. SolarSS adapts the level of layers activated dynamically depending on solar energy availability, and provides an efficient resource allocation and data distribution scheme to minimize data loss.

• Journal of KIISE:Computer Systems and Theory
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• v.33 no.9
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• pp.626-633
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• 2006

The wireless sensor networks are sensing, computing and communication infrastructures that allow us to monitor, instrument, observe, and respond to phenomena in the harsh environment. Sensor operating systems that run on tiny sensor nodes are the key to the performance of the distributed computing environment for the wireless sensor networks. Therefore, sensor operating systems should be able to operate efficiently in terms of energy consumption and resource management. In this paper, we present an efficient memory allocation scheme to improve the time and space efficiency of memory management for the sensor operating systems. Our experimental results show that the proposed scheme performs efficiently in both time and space compared with existing memory allocation mechanisms.

• Journal of KIISE:Computer Systems and Theory
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• v.32 no.5
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• pp.232-242
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• 2005

This paper concerns automatic hardware synthesis from data flow graph (DFG) specification for fast HW/SW cosynthesis. A node in BFG represents a coarse grain block such as FIR and DCT and a port in a block may consume multiple data samples per invocation, which distinguishes our approach from behavioral synthesis and complicates the problem. In the presented design methodology, a dataflow graph with specified algorithm can be mapped to various hardware structures according to the resource allocation and schedule information. This simplifies the management of the area/performance tradeoff in hardware design and widens the design space of hardware implementation of a dataflow graph compared with the previous approaches. Through experiments with some examples, the usefulness of the proposed technique is demonstrated.

• Fire Science and Engineering
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• v.24 no.3
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• pp.119-130
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• 2010

In the fire and disaster prevention administration of which is not developed in comparison with any other administrative system, the systematic improvement is necessary. For system's more development, financial resource of fire service must be increased sufficiently. If fire service's budget is not allocated sufficiently, fire and disaster were not prevented effectively. This study set up hypothesis based on theoretical background and past research. In this study, dependent variables are fire service budget and police service budget per person Whereas independent variables include demand characteristics, economical characteristics, political characteristics, and previous fiscal year's budget. Statistical methods for the hypothesis's verification are regression analysis, correlation analysis and t-test. The major finding on this study are as follows: First, regression analysis showed that significant variable were past budget variable and economical variable. But political variable and demand variable were not significant except for a emergency medical variable. Second, fire service budget's average was not different significantly from police service budget's average. The above result are contingent upon the theory described in this research. A sustained research and development effort will be necessary if substantial and meaningful progress is to be made in fire service budget.

• Korea journal of population studies
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• v.34 no.2
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• pp.91-111
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• 2011

Based on social capital theory, this study intends to understand accessed and mobilized social capital of married women with young children and the difference between two types of social capital in terms of their employment status. Factors related to accessed and mobilized social capital are also investigated. The subjects are 571 married women (284 employed and 287 unemployed) who have children younger than 5 years old. Their networks are revealed to show different composition and resource distribution according to the respective employment status. No significant difference is found in accessing social capital depending on the employment status. However, working women are capable of mobilizing more social capital for economic resources and child-care assistance than non-working women. The employment status is significant only in mobilizing social capital related to child-caring assistance. The effects of variables related to social networks of married women differ according to the types of resources sought for. The choices of married women on the employment status and child-rearing are observed in the findings of the ability to mobilize social capital for child-care assistance. The importance of kin ties and various social services for building social capital are discussed.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.43 no.1
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• pp.110-122
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• 2020

Many companies make considerable efforts in implementing supply chain management systems to increase their competitiveness. In particular, there are significant investments in their ICT (Information and Communication Technology) and supply chain. However, considerable diversity exists in how well firms have been able to assimilate ICT and leverage the business value of it. In addition, studies on supply chains, particularly Real Time Enterprise (RTE) competence, which is cited for rapid information sharing and dynamic capabilities for each role in the supply chain, are insufficient. The purpose of this paper is to explore and evaluate effect of ICT utilization capabilities, including 'ICT internal cooperative capabilities' and 'ICT operational flexibility capabilities', on RTE capabilities (flexibility, visibility and prediction) and supply chain performance. To validate the research model proposed in the study, survey was conducted on companies using ICT along the supply chain of manufacturing industries. 216 data were used, SPSS and AMOS were used for the analysis methods. Study results showed that ICT internal collaboration capabilities affect agility, one of RTE capabilities, but not visibility and prediction, and ICT operational flexibility capabilities have affected all three RTE capacities. And, RTE capabilities had a huge impact on supply chain performance as expected. In this paper, it has been found that the ICT capabilities in manufacturing are an important factor in improving RTE capabilities that are important in the supply chain and improving the performance of the supply chain.

• Journal of Digital Convergence
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• v.14 no.8
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• pp.195-201
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• 2016

The purpose of this study is to find out key factors of successful urban regeneration based on previous studies and relationships between those factors and revisit intention. To draw a conclusion, this study makes surveys including the variables of success factor(External environment factors, Internal environment factors, Internal cultural factors), degree of satisfaction, and degree of revisit intention. And it collects the data from respondents who had been to Gamcheon culture village in Busan. The data is analyzed by applying an exploratory factor analysis and a confirmatory factor analysis. The result of these analysis describes that the Internal environment factors and Internal cultural factors affect the satisfaction degree positively and the degree of satisfaction has positive effects on the revisit intention. The study finds out that unique resource properties should be considered when underdeveloped cities are regenerated. Future study is to generalize the theory through the sampling covered the whole country.

• Korean Journal of Computational Design and Engineering
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• v.13 no.5
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• pp.362-371
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• 2008

Generally, a PLM education program in university consists of lectures of theory, software lab and software development raining as an advanced subject. Most industries want more than these, such as practical problem solving capabilities, teamwork skills and engineering communications including human relationship, rhetoric, technical writing, presentation and etc. Problem-Based Learning is a problem-stimulated and student-centered teaming method, and an innovative education strategy for collaborative and self-directed learning by applying real world problems. Education paradigm changes from "teaching" to "learning" accomplished by team working, and students are encouraged to develop, present, explain and defense their ideas, suggestions or solutions of a problem, and the "cooperative teaming" proceeds spontaneously during team operations. Co-operative education program is an into-grated academic model and a structured educational program combining classroom learning with productive work experience in a field related to a student's academic or career goals. Based on the partnership between academic institutions and industries, students are engaged in real and productive "work" in the industry, in contrast with merely observing. In this paper, PBL with Co-op program is suggested as an effective approach for PLM education, and we made and operated a PBL-based education course with industry co-op program. The Co-op education in industry accompanied with the PBL course in university can improve practical problem solving capabilities of students, including modeling and management of P3R(Product, Process, resource and Plant) using commercial PLM software tools. By the result, we found this to be an effective strategy for helping students, professors and industries succeed in engineering education, especially PLM area.

• Journal of the Korean association of regional geographers
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• v.10 no.4
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• pp.824-832
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• 2004

By reviewing the research papers and books about Korean geography published in China during the recent 20 years, the trend of research on the Korean geography in the filed of general and professional viewpoint was summarized in this paper. For general review, 4 major trends were observed. First, lots of research institutes have been newly established. Second, the amount of journals and books related to the Korean geography are keeping increasing. Third, a series of new academic results arc being achieved. Forth, academic exchange activities are being carried out actively in broader rangers. For professional geography study, researchers are more focused on the study of human geography rather than physical geography. And in the field of physical geography, studies about geology, earthquake and natural resource appeared livelier than others, while in human geography, studies about economic geography attract more interests. It was also observed that problems such as the research fields are limited and Jack of fundamental theory study exist. To solve these problems, the learned circles of Chinese geography should do more efforts, while an effort of introduction of achievements of Korean geography study to china by learned circles of Koran geography are also necessary.

• Journal of Information Science Theory and Practice
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• v.5 no.1
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• pp.47-64
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• 2017

Purpose: This study aims to assess the level of job satisfaction among the practicing Library and Information Science (LIS) professionals in India. Some of the key variables studied include salary, work environment, professional position, working hours, location, employee participation in administrative matters, recognition, and advancement. Scope: The study is limited to LIS professionals in India; however, the results of the study show some degree of commonality among LIS professionals across the world. Methodology/Approach: The study has been purely undertaken by analyzing the primary data collected from practicing library and information professionals across India by circulating an online questionnaire, using Google services and by posting the link on various social groups and other social networking sites such as Groups, Facebook, LinkedIn, discussion forums, and e-mails. Findings: Responses were generated across 20 states and union territories of the country, representing 88.15% territory of India. Of the total responses generated, 72.88% are males and 27.12% females. From the data analysis it emerged that every third library professional in India enters in to LIS profession by chance and not by choice, as 35.59% respondents expressed that they landed in the LIS profession by chance and 60.45% by choice. More than 77% respondents have expressed their willingness to change their present employer, if given better opportunity. More than 80% professionals either fully or partly agree that most of the LIS professionals across India are dissatisfied with their employers. All these and many more areas have been explored, which reflect the aspects of job satisfaction and dissatisfaction among LIS professionals in India.